Synthesis and characterisation of SrCoxFe12-xO19 composite magnetic material (x = 0 – 0.3)

Abstract

SrCo_xFe_12-xO₁₉ is a composite magnetic material that has wide applications in the field of modern technology. This study aims to synthesize and characterize SrCo_xFe_12-xO₁₉ (x = 0 – 0.3) using coprecipitation technique and high temperature sintering. The results showed that increasing cobalt (Co) concentration enhanced the magnetic properties of the composite, including saturation magnetization up to a peak value of 42.5 emu/g at x = 0.3, as well as higher coercivity due to morphological anisotropy and valence change of Fe²⁺ to Fe²⁺. XRD characterization revealed a magnetoplumbite-type crystal structure with a hexagonal M phase, while FTIR analysis identified Fe-O and Co-O bond vibrations that became more intense with the addition of Co. SEM showed morphological changes from lamellar shapes to small spherical particles as Co increased. VSM analysis confirmed the strong interaction between the hard (SrFe₁₂O₁₉) and soft (CoFe₂O₄) magnetic phases, which supports the application of this composite as a microwave absorbing material. These findings highlight the potential of SrCo_xFe_12-xO₁₉ as an advanced magnetic material with characteristics that can be optimized for high-tech applications.